Electric hoisting gear



July 22, 1930.

P. WILSING ELECTRIC HOISTING GEAR Filed July 15, 1927 2 Sheets-Sheet -lFig.1.

Q71/IIIIIIIIIIIJIII/IIIII? July 22, 1930. p, MLSWG 1,771,281

ELECTRIC HOISTTNG GEAR Filed July 13. 1927 2 Sheets-Sheet 2 "a0 vationof t e casin Patented July ZZ, 1930 UNITED, STATES PATENT- OFFICEraunwnsme, or nursnune, enmumr, assrcmon 'ro nme' mmnensnuw serum, ornuxsnuna, Grimm anncrnrc nors'rnm em v Application fled July 18, 1927,Serial No. 305,428, and in Germany Iaroh 8, 1927.

The present invention relates to hoists that are adapted to' a varietyof practical 'require-' ments such as for suspension in a stationaryposition, for being moved in a horizontal plane, or for being mountedupon travelling crabs and the invention has among its obiects to cause asecond rope provided with a oad hook or block to be lowered'as theother- The features 0 the invention are hereinafter set forth byreference-to the accompanying drawings in which Figures 1 and .2 relateto one construction fao embodying the invention in which Figure 1 is alon itudinal section through a hoisting gear, an s Fi re Figure 1, theleft hand side of the figure beas ing apart front elevation of thecasing 5, and the right hand'side of the figure being a partcross-section through the said casing, Figure 3- relatestovanotherconstruction embodyin the invention and is a front'eleofahoist similar in construction to, that il ustrated inFigures 1 and2,;the casing being. provided with ateral pu'lleys, and I Figure 4relates to another construction embod ing the invention and is a sideelevation 0 a'hoist similar in construction to that illustratedinFigures 1 and 2, in which the ro s are provided with blocks. j l .hestationary part 2 of the motor 18 provided in thecasin'g 1, andtherotorshafzh3 on e of the electro-motor'is mounted at 4 left in thepartition wall 4 of the gear casing 5. The shaft has mounted upon it atits forward end, a pinion 6, which enga s in a corresponding set ofinternal teeth 9 wheel 7. The latter is connected with the inion 8 uponthe shaft 9, and the toothed w eel 7 and pinion 8 are preferably madentelgral'.

The/p1nion8 engages the'two toothed w eels 10, which are connected withthe driving pulother hand, by the construction according to 2 is an endview corresponding to i to the casing the toothed vformed by leys 11.Here again one of each of the toothed wheels 10 and a driving pulley 11are formed integral. The ro e 12 iswound a number of times around t edriving pulleys 11, the two ends of the rope'being rov'ided with loadhooks 13 loaded by welg ts 12. The casing 5 is disposed in a positionclose to the pulleys 11 in such manner that it is impossible for therope to leave them, and thus it is unnecessary to provide a special ropeguide.

As the rope ing at one and the same position, the guiding slots 15 maybe madevery narrow. On the the present invention the slots may extendlaterall over almost the whole periphery of the pul eys, so that theropes may pass out of the casing at any desired angle and evenhorizontally.

A brake cone 16 is-provided upon the rotor shait of the motor 2, theopposing cone 17 being formed by the cover plate 18 of the casmg. a Themotor is provided with the axially movable armature 2, so that when thecurrentlis cut ofi the rotor. moves to the ri ht under the'action of thespring 19 and is t us braked.

The spring 19 presses against: a ring-19 which in turn presses againstthe .rollers 4" of the bearing i'. The radial bearin is thus at the sametime-used for absorbing-t e comparatively small axial pressures. I

- In order to provide a suflieient distance between the re forcumbersome loads, they maybe 'giii ed, as,illustratedin Figure 3 f overd lateral pulleys '14 which are mounts in the brackets 19 of the casing.

According to the construction illustrated in Figure 4 each of the ropeends that extend from opposite-sides of the hoist is fastened v bysuitable securing means as indicated at 20.

Blocks21 may-be suspended in loops thus the respective ropes. The lowerblock disposed in its lowermost position is not shown in Figure '4 inorder to make the drawin simpler. The raised y the hooks, at

always passes out of the cas- I res 've loads are mat the compared withthe hoisting gear in which the loads depend directly from the ro ends.

The motor is started up and stop in any suitable known manner from theoor level; it drives the two ulleys 11 simultaneously and uniformly. T elength of the rope that is wound around the two pulleys is adapted tothe hoisting distance. As it is provided at both ends with load hooks,eyes, claws or the like, a load can be raised at each operation of therope by the upwardly moving end of the rope, during which time the otherend of the rope is lowered with or without a load.

I claim:

1. An electric hoist consisting in combination of a casing, anelectro-motor and two juxta-posed driving and load sustaining pulleyswithin the said casing, the said pulleys being mounted upon axessubstantially parallel and in the same plane as the electro-motor shaft,a flexible load suspension member wrapped around the said pulleys, therespective ends of which member bear load-engaging means and depend atthe opposite outer sides of the said pulleys and when unloaded arerespectively of such weight as to subject' 'the said flexible member totension, a countershaft supported within said casing between the saidpulleys, and gearing upon said countershaft transmitting the drive ofthe electro-motor to the two pulleys, substantially as hereinbeforedescribed.

2. An electric hoist according to claim 1, comprising a casing in twodetachable sections, one section enclosing the electro-motor and theother section the two pulleys and the countershaft with the gearingthereon, substantially as hereinbefore described.

3. An electric hoist consisting in combination of a casing, anelectro-motor and two .juxta-posed driving and load sustaining pulleyswithin the said casing, the said pulleys being mounted upon axessubstantially parallel and in the same plane as the electro-motor shaft,a flexible load-suspension member wrapped around the said pulleys, therespective ends of which member bear load-engaging means and depend atthe opposite outer sides of the said pulleys and when unloaded arerespectively of such weight as to subject the said member to tension, acountershaft supported within said casin between said pulleys, andgearing upon said countershaft adapted to cause simultaneous rotation ofthe said pulleys on operation of the said electromotor, the said gearingcomprising a gear wheel with internal teeth, a pinion'on the shaft ofthe electro-motor engaging the said gear wheel, and gear wheels providedrespectively on the said driving pulleys and each engaging the pinion onthe countershaft, substantially as hereinbefore described.

4. An electric hoist consisting in combination of a casing, anelectro-motor having an axially movable rotor and shaft, a brake memberrigidly mounted on said shaft, a co-o crating brake member in fixedrelation to t a said casing, a spring adapted to move the said shaftaxially to engage the brake members, two juxta-posed driving andload-suspension pulleys within saidcasing, said pulleys being mountedupon axes substantially parallel and in the same plane as theelectro-motor shaft, a flexible load-suspension member wrapped aroundthe said pulleys, the respective ends of which member bear load-engagingmeans and depend at the opposite outer side of the saidpulleys andwhenunloaded are respectivel of such weight as-to subject the said memer to tension, a counter-shaft supported within said casing between thesaid pulleys, and gearing upon said countershaft transmitting the driveof the electro-motor to the two pulleys, substantially as hereinbeforedescribed.

5. An electric hoist consisting in combination of a casing formed in twodetachable sections, an electro-motor mounted in one section ofthe saidcasing, two juxta-posed driving and load-sustaining pulleys disposedwithin the second section of the said casing, the said pulleys beingmounted upon axes-substantially parallel and in the same plane as theelectro-motor shaft, 9. flexible load-suspension member wrapped aroundthe said pulleys, the respective ends of which member bear load-engagingmeans and depend on .the opposite outer sides of the said pulleys, and wan unloaded are res ectively of such weight as to subject the sai memberto tension, a countershaft disposed between the said pulleys within thesecond section of the casing, and gearing upon the countershaft fortransmitting the driving from the electro-motor to the said pulleys,substantially as hereinbefore described.

6. An electric hoist according to claim 5, comprising an electro-motorwith axially movable rotor and shaft, a brake member rigid upon the saidshaft, a cover plate to the section of the casin containingthe'electromotor, a brake sur ace upon t e said cover plate, and aspring tending to move the shaft and rotor axially to engage the brakemem bers, substantially as hereinbefore described.

PAUL WILSING.

